Citrix two NIC cards one LAN one WAN

Hello,

I have a server running server 2003 and Citrix Xenapp 5, currently citrix can only be accessed internally our Council will not give us an external IP Address so I have had to purchase BEbroadband to get an additional IP address.

My problem is that One network card has an internal IP address and one has the External, the internal IP address and internal users use a proxy on the same server, my problem is that when people access citrix from the outside it tries to send the data back via the proxy rather than a direct connection to the internet, how can I make it so that when a user access's citrix from the internet they dont use the browsers proxy.

or do i need to create a Vlan between the two NIC's?

Thanks for the help!